What Causes the Car's Hazard Lights to Keep Flashing?
2 Answers
Reasons why the car's hazard lights keep flashing: If the hazard lights won't turn off, it's most likely due to a malfunction in the control box. You should check if the hazard light relay is functioning properly. Use a multimeter to test the output line of the hazard light relay to see if there is a 12v output. Engine oil warning light on: In many cases, it indicates low engine oil level, and adding oil is relatively simple. Coolant temperature warning light on: This usually indicates overheating. When the coolant temperature in the radiator reaches 100 degrees while driving, the temperature warning light will illuminate. Tire pressure warning light on: Determine whether the pressure is too high or too low. Excessive pressure can lead to tire blowouts while driving, so the tire pressure should be reduced. The battery indicator light is used to display the working status of the car battery, and its color is usually red or yellow.
That day, I had just driven out when the hazard lights started flashing nonstop—so embarrassing and dangerous. The most common issue is the hazard light switch getting stuck, possibly due to water ingress or debris. Another culprit is aging wiring in older cars, especially the bundle under the steering wheel, which can fray and short-circuit. Last time, mine started flashing automatically after the wiring got damp from rain. Also, check the flasher relay in the fuse box—if you hear a clicking sound, it might be faulty. Additionally, modern cars' onboard computers can glitch and mistakenly trigger the alarm system. Address it promptly; last year, my neighbor’s car flashed all night because of this, and the battery was dead by morning. For safety, disconnect the negative battery terminal before heading to the repair shop.
